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Most power i can get from a 6" prop

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Peter Christy03/06/2020 12:48:14
1822 forum posts

I remember racing karts with highly tuned Villiers 9E engines back in the day!

We reckoned if it wouldn't do a ton down the straight at Dunkeswell, you weren't competitive! We were VERY competitive, so I'm sure it producing a lot more than 8HP!

laugh

--

Pete

Andy Stephenson03/06/2020 13:33:22
169 forum posts
28 photos
Posted by Shaun Walsh on 02/06/2020 13:05:55:

You can see the thrust for APC props here:

**LINK**

I find this a very strange table. First they seem to have left out the decimal points and then they have not listed sizes I know exist. Also the title says "predicted" which means to me that this is all done by calculation and not by testing.

Andy.

Edited By Andy Stephenson on 03/06/2020 13:34:00

Christopher Morris 203/06/2020 14:39:36
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185 forum posts
Posted by Andy Stephenson on 03/06/2020 13:33:22:
Posted by Shaun Walsh on 02/06/2020 13:05:55:

You can see the thrust for APC props here:

**LINK**

I find this a very strange table. First they seem to have left out the decimal points and then they have not listed sizes I know exist. Also the title says "predicted" which means to me that this is all done by calculation and not by testing.

Andy.

Edited By Andy Stephenson on 03/06/2020 13:34:00

Laugh, a previous post posted this link & i thought it was part imperial & part metric until Shaun gave me a description. Needs a few weeks for newbies like me. Thanks

Christopher Morris 203/06/2020 14:58:57
avatar
185 forum posts
Posted by Peter Christy on 03/06/2020 12:48:14:

I remember racing karts with highly tuned Villiers 9E engines back in the day!

We reckoned if it wouldn't do a ton down the straight at Dunkeswell, you weren't competitive! We were VERY competitive, so I'm sure it producing a lot more than 8HP!

laugh

--

Pete

Hi, my claim to fame is i have beat Lewis Hamilton about 5 times on karting practice days. Now, i don't care that he was 9 year old at the time with an 80cc cadet cart & i was racing 100cc at the time. I am still claiming it. LOL. This was in some good days at Rye House karting track back then, it was free practice for all classes at the same time. But this was a bit dangerous & got spit into group practising.
The 100cc engine we used "quite often Rotax" were good for about 75mph on the very long circuits & the 2 stroke engines were driving up to 18000rpm on the long circuits & 20000 on the short ones. You had to always have your hand over the air intake with the throttle wide open to richen the mixture at the end of the straight for fear of seeing the engine.

Christopher Morris 203/06/2020 16:31:28
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185 forum posts

The 1st image is the starting idea with a 6" intake down to 4" & then holes or slots either underneath or coming our at 45% to the inside. Naturally, there will be a floor & a skirt. "Not shown"

The second version would be with 2 intakes of 6" like below. Naturally with shorter centre tubes to allow for 2 reducers. Would need to buy another one. But you get the idea.

Denis Watkins03/06/2020 16:44:26
4449 forum posts
113 photos

That is an imaginative use of tough materials Christopher

I think your plan is innovative and you are right on the borderline of power but I would like to see you win this one

Christopher Morris 203/06/2020 17:00:32
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185 forum posts
Posted by Denis Watkins on 03/06/2020 16:44:26:

That is an imaginative use of tough materials Christopher

I think your plan is innovative and you are right on the borderline of power but I would like to see you win this one

It was some spare parts i had leftover from my electrical days being put to use. Got the feeling it may be a twin motor version. But this part weighs in at 2.4kg. But batteries, possibly 3 motors, tail section, skirt will soon add up. But it will fly if only a few mm off the ground.

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